Monticello, NM is a city located in Sierra County, New Mexico and has a land area of 232.93 square miles (603.29 km2). The water area for the city is 0.00 square miles or 0.00 km2. There is one unique zip code in Monticello, New Mexico and it is 87939. The area code(s) for Monticello is 575.
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